Do some duck foods produce stinkier poop than others?

We have a duck that likes to come inside our house sometimes. She's really sort of an indoor-outdoor duck. Problem is: the poop REALLY stinks. My daughter heard that certain brands of duck food produce stinkier poop than others. We use Dumor, but she read somewhere that Dumor is supposed to produce the worst smelling poop. Anyone know more about this? Thanks!